<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片区域 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert  show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类: </span>
                    <!-- 级联选择框 -->
                     <el-cascader  v-model="selectedCateKeys" :options="CateList"   @change="handleChange" :props="cateProps" expand-trigger="hover"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
             <!-- 添加动态参数面板 -->
             <el-tab-pane label="动态参数" name="many">
                 <el-button type="primary" size="medium" :disabled="isBtnDisabled" @click="addDialogVisable = true">添加参数</el-button>
                 <!-- 动态参数列表 -->
                 <el-table :data="manyTableData" border stripe>
                     <!-- 展开行 -->
                     <el-table-column type="expand">
                         <!-- 循环渲染tag标签 -->
                         <template slot-scope="scope">
                             <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i, scope.row)">{{item}}</el-tag>
                             <!-- 输入的文本框 -->
                             <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                              @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                             </el-input>
                              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                         </template>
                     </el-table-column>
                     <!-- 索引 -->
                     <el-table-column type="index" label="#"></el-table-column>
                     <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                     <el-table-column label="操作" >
                         <template slot-scope="scope">
                             <el-button type="primary" icon="el-icon-edit" @click="showEditDialog">编辑</el-button>
                             <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)" >删除</el-button>
                         </template>
                     </el-table-column>
                 </el-table>
             </el-tab-pane>
             <!-- 添加静态属性面板 -->
             <el-tab-pane label="静态属性" name="only">
                 <el-button type="primary" size="medium" :disabled="isBtnDisabled" @click="addDialogVisable = true">添加属性</el-button>
                 <!--静态属性表格  -->
                 <el-table :data="onlyTableData" border stripe>
                     <!-- 展开行 -->
                     <el-table-column type="expand">
                         <!-- 循环渲染tag标签 -->
                         <template slot-scope="scope">
                             <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i, scope.row)">{{item}}</el-tag>
                             <!-- 输入的文本框 -->
                             <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                              @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                             </el-input>
                              <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                         </template>
                     </el-table-column>
                     <!-- 索引 -->
                     <el-table-column type="index" label="#"></el-table-column>
                     <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                     <el-table-column label="操作" >
                         <template slot-scope="scope">
                             <el-button type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                             <el-button type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                         </template>
                     </el-table-column>
                 </el-table>
             </el-tab-pane>
            </el-tabs> 
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog  :title="'添加' + titleText" :visible.sync="addDialogVisable" width="50%" @close="addDialogClosed">
            <!-- 添加参数对话框输入 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisable = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 编辑参数对话框 -->
        <el-dialog  :title="'修改' + titleText" :visible.sync="editDialogVisable" width="50%" @close="editDialogClosed">
            <!-- 添加参数对话框输入 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" class="demo-ruleForm">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisable = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            //商品分类列表
            CateList: [],
            //级联选择框配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children: 'children',
            },
            //级联选择框双向绑定数组
            selectedCateKeys:[],   
            //默认被激活的页签的名称
            activeName:'many',
            //动态参数数据
            manyTableData: [],
            //静态属性数据
            onlyTableData: [],
            //控制添加属性对话框的显示与隐藏
            addDialogVisable: false,
            //添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            //添加表单验证规则对象
            addFormRules: {
                attr_name: [{ required: true, message:'请输入参数名称', trigger: 'blur'}]
            },
            //控制修改参数对话框的显示与隐藏
            editDialogVisable: false,
            //修改表单数据对象
            editForm:{},
            //修改表单验证规则对象
            editFormRules: {
                attr_name: [{ required: true, message:'请输入参数名称', trigger: 'blur'}]
            },

        }
    },

    created() {
        this.getCateList()
    },

    methods: {
        //获取所有商品分类
        async getCateList(){
            const{ data:res } = await this.$http.get('categories')
            if(res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败!')
            }
            this.CateList = res.data 
        },

        //级联选择框选中项变化
        handleChange(){
            this.getParamsData()
        },

        //tab页签点击事件处理
        handleTabClick(){
            this.getParamsData()
        },

        //获取参数的列表数据
        async getParamsData(){
            //证明选中的是第三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }

            //根据所选分类ID和所处面板获取对应参数
           const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`, {params : { sel: this.activeName}})
           if( res.meta.status !== 200){
               return this.$message.error('获取参数列表失败!')
           }
               res.data.forEach(item => {
                   item.attr_vals = item.attr_vals ? (item.attr_vals || '').split(' ') : []
                   //控制文本框的显示与隐藏
                   item.inputVisible = false
                   //文本框输入的值
                   item.inputVisible =''
               })
            //判断数据表格所属
           if(this.activeName === 'many'){
               this.manyTableData = res.data
           }
           else{
               this.onlyTableData = res.data
           }
        },

        //监听对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },

        //点击确定按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const { data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName,    
                })
                if(res.meta.status !== 201 ){
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisable = false
                this.getParamsData()
            })
        },
        //点击编辑按钮显示对话框
        async showEditDialog(attr_id){
            //查询当前参数的信息
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {params : {attr_sel: this.activeName}})
            if(res.meta.status !== 200){
                return this.$message.error('获取参数信息失败!')
            }

            this.editForm = res.data
            this.editDialogVisable = true
        },
        //重置修改表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击修改确定按钮
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const {data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {attr_name: this.editForm.attr_name, attr_sel: this.activeName})
                if(res.meta.status !==200 ){
                    return this.$message.error('修改参数失败!')
                }
                this.$message.success('修改参数成功!')
                this.getParamsData()
                this.editDialogVisable = false
            })
        },
        //点击删除按钮事件  根据ID删除
        async removeParams(attr_id){
          const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        //用户取消删除操作
        if (confirmResult !== 'confirm'){
            return this.$message.info('已取消删除!')
        }

        //删除的业务逻辑
        const{data:res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status !== 200){
            return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
        },

        //文本框失去焦点或按下enter
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //输入数据后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
        },

        //对attr_vals的操作保存到数据库
        async saveAttrVals(row){
            const {data:res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error('修改参数列表失败!')
            }

            this.$message.success('修改参数列表成功!')
        },
        //点击按钮 展示文本输入框
        showInput(row){
            row.inputVisible = true
            //让文本框自动获得焦点
            //nextTick 当页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
        });
        },

        //关闭标签事件,删除对应选项
        handleClosed(i,row){
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
        
    },

    computed:{
        //如果按钮需要被禁用 返回true ，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },

        //当前选中的三级分类的ID
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },

        //动态计算标题文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态属性'
            }
            return '静态属性'
        },
    },
}
</script>

<style lang="less" scoped>

.cat_opt{
    margin: 15px  0;
}

.el-tag{
    margin: 10px;
}

.input-new-tag{
    width: 120px;
}
</style>
